EUVD-2023-34423

Comprehensive Technical Analysis of EUVD-2023-34423

1. Vulnerability Assessment and Severity Evaluation

Vulnerability Description: The Wordapp plugin for WordPress is vulnerable to authorization bypass due to the use of an insufficiently unique cryptographic signature on the wa_pdx_op_config_set function in versions up to, and including, 1.5.0. This vulnerability allows unauthenticated attackers to change the validation_token in the plugin configuration, thereby gaining access to the plugin's remote control functionalities. This can lead to privilege escalation, including the creation of an admin access URL.

Severity Evaluation: The vulnerability has a base score of 9.8 according to CVSS v3.1, which is considered critical. The scoring vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H indicates the following:

• Attack Vector (AV): Network (N)
• Attack Complexity (AC): Low (L)
• Privileges Required (PR): None (N)
• User Interaction (UI): None (N)
• Scope (S): Unchanged (U)
• Confidentiality (C): High (H)
• Integrity (I): High (H)
• Availability (A): High (H)

This high severity score underscores the critical nature of the vulnerability, which can be exploited remotely without any special privileges or user interaction.

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

• Unauthenticated Access: Attackers can exploit the vulnerability without needing to authenticate, making it a highly accessible attack vector.
• Remote Control: By changing the validation_token, attackers can gain remote control over the plugin's functionalities.
• Privilege Escalation: The ability to create an admin access URL can lead to full administrative control over the WordPress site.

Exploitation Methods:

• Cryptographic Signature Bypass: Attackers can bypass the cryptographic signature used in the wa_pdx_op_config_set function by exploiting its insufficient uniqueness.
• Configuration Manipulation: Once the signature is bypassed, attackers can manipulate the plugin configuration to change the validation_token.
• Admin Access Creation: With the validation_token changed, attackers can create an admin access URL, leading to privilege escalation.

3. Affected Systems and Software Versions

Affected Systems:

• WordPress sites using the Wordapp plugin.

Affected Software Versions:

• Wordapp plugin versions up to and including 1.5.0.

4. Recommended Mitigation Strategies

Immediate Actions:

• Update the Plugin: Ensure that the Wordapp plugin is updated to a version higher than 1.5.0, where the vulnerability has been patched.
• Disable the Plugin: If an update is not immediately possible, consider disabling the plugin until a secure version is available.

Long-Term Mitigation:

• Regular Audits: Conduct regular security audits of all plugins and themes used on WordPress sites.
• Access Controls: Implement strict access controls and monitoring for administrative functionalities.
• Security Plugins: Use security plugins like Wordfence to monitor and protect against vulnerabilities.

5. Impact on European Cybersecurity Landscape

Regulatory Compliance:

• GDPR: The vulnerability could lead to unauthorized access to personal data, potentially violating GDPR regulations.
• NIS Directive: Organizations under the NIS Directive must ensure the security of their digital infrastructure, making this vulnerability a significant concern.

Operational Impact:

• Data Breaches: Unauthorized access can lead to data breaches, financial loss, and reputational damage.
• Service Disruption: Attackers could disrupt services, leading to operational downtime and loss of productivity.

6. Technical Details for Security Professionals

Vulnerability Details:

• Function Affected: wa_pdx_op_config_set
• Cryptographic Signature Issue: The signature used is not sufficiently unique, allowing for bypass.
• Configuration Parameter: The validation_token in the plugin configuration is the target for manipulation.

Code References:

• config.php: Line 59
• pdx.php: Line 64
• access.php: Line 28

References:

• Wordfence Threat Intel
• WordPress Plugin Repository
• WordPress Plugin Repository
• WordPress Plugin Repository

Aliases:

• CVE-2023-2987
• GSD-2023-2987

Assigner:

• Wordfence

ENISA IDs:

• Product: Wordapp (versions ≤1.5.0)
• Vendor: wordapp

This comprehensive analysis highlights the critical nature of the vulnerability and the urgent need for mitigation to protect against potential exploits.